Just because of the compiler, or are there other preconditions only available in an existing image?
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During bootstrap, the hosting Pharo serves a virtual object memory with object stubs and provides an AST interpreter. It is a quite complicated process. It is possible to rewrite it to another language but not easy.
I will try to directly start and run the Smalltalk-80 sources file and somehow pre-create the required global objects in the C++ code.